When you have a chance, open a copy of the 2nd book in THE HARDY BOYS series, "The House on the Cliff," by Franklin W. Dixon. It's a story about two boy detectives solving a crime. On page 77, Frank Hardy observes something suspicious and declares that he smells "a n!gger in the woodpile."
The author (whose real name was Leslie MacFarlane) wasn't trying to be offensive. Back in those days (1927), the N-word, the one we get reported and banned for saying now, was just one more word in common use. That was how everybody referred to Blacks, including the Blacks themselves.
You can't have both Freedom of Speech and Special Protections Against Offense. Your society must choose between them. It's one or the other, but never both. When you grant a minority special protection from being offended, its members waste no time in finding just as many ways to be offended as possible. Declaring that they are offended has just become their road to political power and economic gains. Everyone else, meanwhile, still has to work for those things.
That's why, over the years, we've seen one word after another pass from being accepted to being vilified. The N-Word was succeeded by the more recent n-word, which we could still say on Yahoo Answers until quite recently. Not "N-ger," but "N-gro." Then we got "colored people."
After that, it was that N-gro word again. Blacks were proud of the N-gro word for many years; now they don't want to hear it. Then it was "Blacks." Then it was "Afro-American," and now it's "African-American." We've had a parade of new words, one after another. You had to stay in fashion, or those in authority would censor you or threaten you in some way.
These constant changes serve to keep White people hoppin', always uncertain, always on the defensive. That is what they're supposed to do.
You can't have both free speech and special protections from offense. Our Founding Fathers considered the matter and deemed free speech to be the more important. Of course, they were White guys.
"If ye love wealth better than liberty, the tranquility of servitude better than the animating contest of freedom, go home from us in peace. We ask not your counsels or arms. Crouch down and lick the hands which feed you. May your chains set lightly upon you, and may posterity forget that ye were our countrymen." - Samuel Adams, speech at the Philadelphia State House, August 1, 1776